[VideoPlayer] Hide the spinner on playing the video
[VideoPlayer] Hide the spinner on playing the video

This patch fixes the regression by https://codereview.chromium.org/1134603002/diff/1/ui/file_manager/video_player/css/video_player.css

BUG=488213
TEST=none
TBR=yoshiki@chromium.org

Review URL: https://codereview.chromium.org/1141183004

Cr-Commit-Position: refs/heads/master@{#330342}
(cherry picked from commit 3ff0cb0f96e577dddc87eabad5ff05a6ecbff397)

Review URL: https://codereview.chromium.org/1144953003

Cr-Commit-Position: d34a0005849006230ae7ffb1a9693419810a06bc@{#27}
Cr-Branched-From: 40cda19e609fd36fbf5fe489055423e611631abc@{#330231}

PeterWangIntel/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Fireblend/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Fireblend/chromium-crosswalk,Fireblend/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Fireblend/chromium-crosswalk,Fireblend/chromium-crosswalk,Fireblend/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Fireblend/chromium-crosswalk,Fireblend/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Fireblend/chromium-crosswalk